Bauhaus on Steroids

Okay, I know I am out of my area of expertise here, but this building next to an abandoned mine outside of Marquette, MI just had me scratching my head. I know, form follows function and there has to be a very good reason why this building looks the way it does. I am not sure I really need to know. I just love its quirky-ness, and how it emerges from the hillside like some bizarro world monstrosity. I think the square part on top must be where all the corporate suits sit. Yea, that's it. Corporate headquarters on top— with the principals getting a window office.